Noise-induced asymmetries limits, as a function of the S/N, of the difference in velocity between the peak and selected bisector levels (in percentage of the intensity peak, as indicated in the plot) for V500 CALIFA spectra derived from a large number of modeled single-Gaussian profiles. The ΔVb obtained for each selected bisector level are within the curves for that bisector. Any ΔVb beyond these curves should be indicating the presence of secondary gaseous components.
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